My T28 spools nice and fast (full boost by 3500) but will max out at 300whp...MAX.

What would you suggest for a 350-400whp goal that won't spool too slow? I was originally gonna go with a t3/t04e but I probaly wont see full boost by 5,000rpm.

Will this be the consequence, or is there a solution?

 

 

SC34.
maybe SC50

 

SC50- 50 trim compressor wheel, T31 turbine wheel, .48ar turbine housing. Nothing that will make power like this turbo and spool like this turbo unless its a ball-bearing version of this same turbo

 

i'm looking for about the same kind of power...and i'm looking at the SC34....I haven't found maps or anything to pinpoint the information....any more deeper info on the SC34

 

I was looking into the SC50. Never knew there was a SC34, maybe I should look into that ;P

 

whats the differnece between the sc34 and sc50?

 

SC34 is a 57 trim compressor wheel while SC50 is a 50 trim compressor wheel.

 

Chris, can they make this turbo using the T04S housing (or maybe in their 60 trim turbo) . . . something about the big comp. housing that makes my car feel . . . hmmm less inadequate j/k

 

Probably could be made, but if you need an "S" housing you need something a lil bigger then a 60 trim.. why not go SC61?

 

I want something thats gonna spool relatively quick and I've had my eyes on the GT35E ever since I heard about it, but I would've thought the SC34 or something alittle smaller than the SC61/GT35E would be alittle more fun. I dunno though

 

S housing will spool up slower.. small turbo= fun? maybe until you get in a race!

 

How would it not be fun? I dont remember ever hearing anyone liking a real peaky powerband, which is something a larger turbo would do (now granted I'm not trying to make the SC61 seem like a T88) . The way I see it, the smaller one would provide a more usable and fun powerband. I've been thinking *slightly smaller turbo + gear dependant boost controller = fun street car* maybe I'm wrong though


Modified by AVATAR at 7:59 PM 3/26/2004

 

SC61's not really that big though.. The powerband is only peaky if your afraid to rev out the motor. You have the right idea, quick spooling turbo, broad powerband and gear based boost.. Are you going to be running the built LSvtec still?

 

How about non stunna turbos, like regular Garretts rather than Precision's lineup I'm on a budget.

How much of a difference in spool time is there between a t3/t04e 57 trim and 60 trim? Assuming everything else is the same.

 

not much difference at all. the turbine side dictates the majority of the spool up characteristics and potential power.

 

I am kinda afraid to rev it cause it's shitty R/S ratio and yes it's still the CR/VTEC (basically). It just always seemed abit excessive buying a turbo that didnt "wake up" till around 15psi or so and supported HP levels that I would never touch. I just think about this soo much and constantly am juggling the GT35E and they next smaller turbos.

P.S. the Precision definately isnt for tha StUnnaZ . . . if you shop around enough you can find them roughly about $100 more than the something comprable to one in Garretts line but nicer

 

Theres just so many ways to look at it.. Now, theres no point in having a turbo that peaks power at 8500 if you are shifting at 8k.. Pre-determined rev limits suck ***.. Ideally you would want to rev the motor until it stops providing you with acceleration in that particular gear. Problem is, valvetrain and R/S ratio's won't always allow that, so sometimes you gotta work with what ya got..

Say we look at two different powerbands.. GT35e on GSR and SC44 on GSR.. the GT35e will take slightly longer to spool up(about 500rpm) but it will allow you to accelerate for an extra 1000rpm's. If your motor can handle the rev's, and you set up your gearing correctly, the set up w/ the bigger turbo will get into boost at about the same time(not rpm) as the motor w/ the smaller turbo.... This is because when you tighten the gears you change the mph at which you hit a certain rpm, so one car might hit 5000(full boost) at the same time the other car hits 5500(full boost) .. Plus, it will make the same hp @ less psi, so the target boost that you have to spool up too is less as well..

The problem is that people don't change the combination, and they just end up w/ more lag. They put these "big" turbos on cars w/ stock rev limits and have to short shift the powerband.. BEGIN RANT< and people are so fascinated w/ flat torque curves on H-T and they don't realize that if torque hasn't fallen off YOU ARE STILL ACCELERATING IN THAT GEAR!!!! > END RANT

I do think you have the right idea anthony. You got a motor that makes big mid-range torque and you are limited by R/S to how high you can rev it.. Its that whole trading torque for RPM thing.. I guess w/ your motor you are focused more on torque because there is only so much you can do w/ ur rpm's. So I see why you are scared to go w/ the GT35e.. however, I think the GT35e is right on the verge of too big for you but almost perfect. On a 2.0L LSvtec you should be @ 10psi about 4k rpm's and your peak power will be just after 8k.. Youll make alot more power at the same psi then w/ the SC44.. With the SC44 your likely to be at 10psi around 3500(2.0L LS) and you will probably peak hp around 7500 and accelerate past 8k.. Whatever you lack in HP and torque w/ the 44 I guess you could make up w/ higher boost levels. I guess its up to you man!

 

This is the stuff that racks my brain daily . . . not that I have the money yet for my build, it's just something I want to be positive about before buying. Why God cant the GT35R be cheaper

 

yeah same here.. what if you just bore the inlet or exhaust? then would it be kinda the same as a bigger turbo? i personally dont get all the numbers when speaking about turbos..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91hatchcivic &raquo;</TD></TR><TR><TD CLASS="quote">.. what if you just bore the inlet or exhaust? then would it be kinda the same as a bigger turbo? </TD></TR></TABLE>

or you could just buy whatever you are thinking of "boring" or porting and just buy the next A/R size bigger.

 

Hey guys, here's a challenge

How would these work, regarding spool time and power? Keep in mind this is for a 9.2:1 compression LS.

1.) Garrett T3/T04E 57 trim with .63 A/R w/stage 3 exhaust wheel.

2.) T04E Compressor: 0.70 A/R, "46" trim
T3 Turbine: 0.6 A/R, STAGE II trim, 50mm exducer

3.) T04E TURBOCHARGER

WET FLOATING BALL BEARINGS

T3 / T4 FOOTPRINT OK !!

SPECS:

.57T COMPRESSOR WHEEL
.50 A/R COMPRESSOR
.63 A/R TURBINE


Thanks again Trying to learn as I go along ;P


Modified by Hoosier Daddy at 3:02 AM 3/29/2004